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Manufacturing method of polyacrylic acid-series water-absorbent resin

A manufacturing method, acrylic-based technology, applied in the field of polyacrylic-based water-absorbent resin manufacturing, capable of solving problems such as increased gel fragmentation, porous structure destruction, and increased specific surface area

Inactive Publication Date: 2018-06-22
宜兴丹森科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain a water-absorbent resin with better foaming effect, it is often necessary to add a surfactant to the polymerization system to stabilize the size of the bubbles, which will lead to a decrease in the surface tension of the water-absorbent resin during use and will inhibit the liquid absorption characteristics of the product.
[0017] In addition, the technology disclosed in the said patent improves the liquid absorption rate of the water-absorbent resin, but it is still insufficient, which is attributed to the strong shearing or extrusion force at the stage of granulation and the like after the porous structure gel is formed, resulting in The porous structure formed by the gel is destroyed in a large amount, and finally the effect of effectively increasing the specific surface area of ​​SAP cannot be achieved.
At the same time, due to the existence of the porous structure of the gel particles, the degree of gel fragmentation increases, and the porous structure itself leads to an increase in the specific surface area, resulting in too fast water loss on the surface of the gel, and a substantial increase in the residual monomer

Method used

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  • Manufacturing method of polyacrylic acid-series water-absorbent resin

Examples

Experimental program
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Effect test

manufacture example 1

[0130] The acrylic acid / sodium acrylate mixed monomer solution (the molar ratio of acrylic acid / sodium acrylate is 2.2 / 7.8) was transported through pipelines, the monomer concentration of acrylic acid / sodium acrylate was 44.0wt%, and the flow rate of the monomer solution was 8689kg / h. The temperature of the monomer solution is 80-90°C. Polyethylene glycol diacrylate (molecular weight: 522) with a concentration of 11.3 wt% was transported at the branch of the monomer solution pipeline, and the flow rate was 72 kg / h. In addition, the azobisisobutylamidine hydrochloride aqueous solution (flow 50kg / h) and the sodium persulfate aqueous solution (flow 60kg / h) with a concentration of 4wt% were mixed by a delivery pump to form an initiator mixed turbidity. Liquid, and the mixed turbid liquid is transported to the monomer through the branch of the monomer solution pipeline to carry out the polymerization reaction. The reaction solution is sprayed onto the reaction bed to form a monome...

Embodiment 1

[0132] Take the hydrogel-like polymer with a porous structure in Manufacturing Example 1, and use scissors to cut it into fine particles of gel. The particle size distribution of the gel is 2-15 mm, and the destruction rate of the porous structure of the gel particles is less than 20%. Spread the gel particles on a wire mesh for drying at a drying temperature of 190° C. for 1 hour to obtain a polymer with a porous cross-linked structure (pore size 100-200 microns). The dried porous cross-linked polymer is finely granulated by a crushing machine, and sieved to obtain a particle size of 300-425 microns, a moisture content of 3.9 wt%, a CRC of 40.3 g / g, and a vortex absorption rate of 28 sec. A water-absorbing resin with a granular porous structure per g and a residual monomer content of 285 ppm, with a pore size of 100 to 200 microns.

Embodiment 2

[0134] Take the hydrogel polymer with porous structure in Manufacturing Example 1, and use scissors to cut it into gel sheets with a diameter of 5 cm. The porous structure destruction rate of the gel particles is less than 5%. Spread the gel on a wire mesh for drying at a temperature of 190° C. for 1 hour to obtain a polymer with a porous cross-linked structure (pore size 100-200 microns). The dried porous cross-linked polymer is finely granulated with a crushing machine, and sieved to obtain a particle size of 300-425 microns, a moisture content of 4.5 wt%, a CRC of 39.5 g / g, and a vortex absorption rate of 25 sec. A water-absorbing resin with a granular porous structure per g and a residual monomer content of 197 ppm, with a pore size of 100 to 200 microns.

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Abstract

The invention discloses a manufacturing method of polyacrylic acid-series water-absorbent resin. The manufacturing method comprises the following steps: obtaining an aqueous solution which contains unsaturated acrylic monomers and a cross-linking agent; mixing foaming agent particles and / or a foaming agent solution, unsaturated acrylic monomers and a cross-linking agent aqueous solution; polymerizing a monomer water solution to form a porous gel-like cross-linked polymer; crushing the porous gel-like cross-linked polymer into gel particles through shearing and / or extruding acting force in a polymerizing process or after polymerizing, wherein the number average particle size of the gel particles is 0.5 to 20 mm, the weight percentage of the gel particles with the particle size of greater than 2 mm is 10 to 100 percent, and the porous structure destruction rate of the gel particles is 0 to 70 percent after the porous gel-like cross-linked polymer is subjected to the shearing and / or extruding acting force; further drying, fining and screening the manufactured gel particles. The liquid absorption characteristic of the water-absorbent resin is not influenced; the water-absorbent resin with high-speed liquid absorption rate and low monomer residue amount can be produced and obtained highly effectively.

Description

technical field [0001] The present invention relates to a method for producing a polyacrylic acid-based water-absorbent resin. Specifically, it is suitable for absorbent articles, such as paper diapers (disposable diapers), sanitary napkins, incontinence pads, mattresses, pet pads, wound care materials, building materials, soil water retention materials and other products, and has rapid liquid absorption performance A polyacrylic acid-based water-absorbent resin with a low residual monomer content and a method for producing the same. Background technique [0002] Super absorbent polymer (SAP), also known as super absorbent resin, is a cross-linked polymer containing strong hydrophilic groups that is insoluble in water but can absorb tens, hundreds or even thousands of times its own weight. polymer. Superabsorbent resins are now widely used in various fields such as diapers, sanitary napkins, adult incontinence products and other sanitary products and soil moisturizers. At...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F222/20C08J9/10
CPCC08F220/06C08J9/102C08J2203/04C08J2333/02C08F222/1063
Inventor 顾子旭胡健徐亮徐科峰杭渊
Owner 宜兴丹森科技有限公司
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